域名查询系统

需要引用

using System.IO;

using System.Net.Sockets;

 

    void doQuery(Object sender, EventArgs e)

    {

        string strDomain = txtDomain.Text;

        char[] chSplit = { '.' };

        string[] arrDomain = strDomain.Split(chSplit);

 

        int nLength = arrDomain[1].Length;

 

        string strServer;

        // 如果是查询的是中国域名则改变目标服务器  

        if (arrDomain[arrDomain.Length - 1] == "cn")

        {

            // 查询以.cn结尾的域名的Whois服务器

            strServer = "drop.cnnic.net.cn"; [Ty1] 

        }

        else

        {

            // 查询以.com结尾的域名的Whois服务器

            strServer = "whois.onlinenic.com"; [Ty2] 

        }

 

 

        string strResponse;

        // 开始查询域名

        bool bSuccess = DoWhoisLookup(strDomain, strServer, out strResponse);

        if (bSuccess)

        {

            txtResult.Text = strResponse;

        }

        else

        {

            txtResult.Text = " 查询失败" ;

        }

    }

 

    bool DoWhoisLookup(string strDomain [Ty3]  , string strServer [Ty4]  , out string strResponse)

    {

        strResponse = "none";

        bool bSuccess = false;

 

        TcpClient tcpc = new TcpClient();

        try

        {

            tcpc.Connect(strServer [Ty5]  , 43 [Ty6]  );

            strDomain += "/r/n";

            Byte[] arrDomain = Encoding.ASCII.GetBytes(strDomain.ToCharArray());

            try

            {

                string str;

                Stream s = tcpc.GetStream();

                s.Write(arrDomain, 0, strDomain.Length);

 

                StreamReader sr = new StreamReader(tcpc.GetStream(), Encoding.Default);

                StringBuilder strBuilder = new StringBuilder();

                while (-1 != sr.Peek())

                {

                    strBuilder.Append(sr.ReadLine() + "<br>");

                }

 

                tcpc.Close();

 

                bSuccess = true;

                strResponse = strBuilder.ToString();

            }

            catch (Exception e)

            {

                strResponse = e.ToString();

            }

            return bSuccess;

        }

        catch (Exception ee)

        {

            strResponse = " 不能连接到查询服务器" ;

            return false;

        }

    }